/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.gds.mem;

import org.junit.jupiter.api.Test;

import static org.assertj.core.api.AssertionsForClassTypes.assertThatCode;

class JolMemoryUsageTest {

    @Test
    void ofShouldNotFailIfJOLFails() {
        assertThatCode(() -> MemoryUsage.sizeOf(new JOLMightFail())).doesNotThrowAnyException();
    }

    // The nested recursive ThreadLocal causes JOL to be unable to access some attributes of the class on the ZULU JVM
    private static final class JOLMightFail {
        private final ThreadLocal<JOLMightFail> threadLocal;

        private JOLMightFail() {threadLocal = ThreadLocal.withInitial(() -> this);}

        ThreadLocal<JOLMightFail> getThreadLocal() {
            return threadLocal;
        }
    }

}
